Unimplemented function for saving and loading model file from SD card in N2Coprocessor class.

Author: nthnn

src/n2cmu.h

@@ -528,6 +528,12 @@ class N2Coprocessor {
      * @param outputGrad Array to store output neuron gradients.
      */
     void getOutputGradient(float* outputGrad);
+
+    // Not yet implemented.
+    void loadFromFile(const char *modelFilename);
+
+    // Not yet implemented.
+    void saveToFile(const char* modelFilename);
 };
 
 #endif